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Solution


Q.

Direction ratios of two lines are a, b, c and 1bc, 1ca, 1ab. The lines are :
1 Mutually perpendicular  
2 Parallel  
3 Coincident  
4 None of the above  

Ans.

(2)

Ans.        Parallel

Explanation:

As,         a(1/bc)=b(1/ca)=c(1/ab)

Hence, lines are parallel.